Cita APA (7a ed.)

Allen, J., & Betts, J. L. (1971). USA: History with documents. American Book Comp.

Cita Chicago Style (17a ed.)

Allen, Jack, y John L. Betts. USA: History with Documents. New York [u.a.]: American Book Comp, 1971.

Cita MLA (9a ed.)

Allen, Jack, y John L. Betts. USA: History with Documents. American Book Comp, 1971.